Geothermal waterfalls in Tuscany.

The leathery remains of a woman who died in the 13th century now lie in a church named for her.

This massive rock balanced for thousands of years being tossed here during a volcanic eruption.

This incredible second-century sculpture depicts a trio of gods worshipped by the ancient Romans.

A semi-abandoned village destroyed by U.S. bombings during World War II dominates the valley of Turano.

This long-abandoned village sits across a narrow gorge from a still-inhabited settlement that was once its twin.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

The underground sanctuary of a mysterious ancient cult.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

When occupying Nazi troops detonated a mine below, medieval frescoes were revealed in this small cliff-side hermitage.

A collection of objects supposedly singed by the hands of souls in purgatory.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.